mruby/mruby — pull request #2681 by sdottaka (2014-12-19 23:33:47+00:00)
Title: mrdb: fix that break command cannot handle Windows paths

Before fix:
```
$ mrdb c:\tmp\b.rb
(c:\tmp\b.rb:1) break c:\tmp\b.rb:3
Class name 'c' is invalid.
```

After fix:
```
$ mrdb c:\tmp\b.rb
(c:\tmp\b.rb:1) break c:\tmp\b.rb:3
Breakpoint 1: file c:\tmp\b.rb, line 3.
```